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2. Metabolisable energy and feeding systems for ruminants;Blaxter,1974
3. The Energy Cost of Horizontal Walking in Cattle and Horses of Various Ages and Bodyweights;Hall;Res. Bull. Mo. Agric. Exp. Stn.,1934
4. A new net energy system for ruminants;Harkins;Anim. Prod.,1974
5. Die Verwertung der Futterenergie durch wachsende Bullen. 2. Mitteilung;Jentsch;Arch. Tierernaehr.,1976